apple is in many ways a mentor company for us. they think about simplicity of design and not feature, feature, feature, but what can we remove from the product? to make it easier to use and simpler to use? and that is the kind of thing we aspire to, so it is helpful for us to work with them. >> rose: how do you see the roles of facebook and twitter developing? >> i think that they are very different companies, for one. i think that we think about people and the kind of accounts they follow, painting a picture of an interest graph, by which i mean i followed san francisco 49ers but they are not my friend. on my facebook i have a collection of friends. >> rose: everything you want to know about 49ers. >> on facebook, you know, i have a group of friends and they are my friend and there is a symmetrical relationship here and on twitter it is asymmetric, pushing that forward, i think that the way the companies will evolve is, you will see more real-time communication, more sharing, more willingness to share, so it is definitely the cas